/*-
 * <<
 * task
 * ==
 * Copyright (C) 2019 sia
 * ==
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * >>
 */

package com.sia.hunter.helper;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TreeSet;
import java.util.regex.Pattern;

/**
 * @description StringHelper
 * @see
 * @author pengfeili23
 * @date 2018-07-11 16:11:19
 * @version V1.0.0
 */
public class StringHelper {

  private static final String FOLDER_SEPARATOR = "/";

  private static final char EXTENSION_SEPARATOR = '.';

  private StringHelper() {}

  // Empty checks
  // -----------------------------------------------------------------------

  /**
   * Checks if a String is empty ("") or null.
   *
   * <p>
   *
   * <pre>
   * StringUtils.isEmpty(null)      = true
   * StringUtils.isEmpty("")        = true
   * StringUtils.isEmpty(" ")       = false
   * StringUtils.isEmpty("bob")     = false
   * StringUtils.isEmpty("  bob  ") = false
   * </pre>
   *
   * <p>
   *
   * <p>NOTE: This method changed in Lang version 2.0. It no longer trims the String. That
   * functionality is available in isBlank().
   *
   * @param str the String to check, may be null
   * @return <code>true</code> if the String is empty or null
   */
  public static boolean isEmpty(String str) {

    return str == null || str.length() == 0 || "null".equals(str);
  }

  /**
   * Removes a substring only if it is at the end of a source string, otherwise returns the source
   * string.
   *
   * <p>
   *
   * <p>A {@code null} source string will return {@code null}. An empty ("") source string will
   * return the empty string. A {@code null} search string will return the source string.
   *
   * <p>
   *
   * <pre>
   * StringUtils.removeEnd(null, *) = null
   * StringUtils.removeEnd("", *) = ""
   * StringUtils.removeEnd(*, null) = *
   * StringUtils.removeEnd("www.domain.com", ".com.") = "www.domain.com"
   * StringUtils.removeEnd("www.domain.com", ".com") = "www.domain"
   * StringUtils.removeEnd("www.domain.com", "domain") = "www.domain.com"
   * StringUtils.removeEnd("abc", "") = "abc"
   * </pre>
   *
   * @param str the source String to search, may be null
   * @param remove the String to search for and remove, may be null
   * @return the substring with the string removed if found, {@code null} if null String input
   */
  public static String removeEnd(String str, String remove) {

    if (isEmpty(str) || isEmpty(remove)) {
      return str;
    }
    if (str.endsWith(remove)) {
      return str.substring(0, str.length() - remove.length());
    }
    return str;
  }

  // ---------------------------------------------------------------------
  // General convenience methods for working with Strings
  // ---------------------------------------------------------------------

  /**
   * Check that the given CharSequence is neither <code>null</code> nor of length 0. Note: Will
   * return <code>true</code> for a CharSequence that purely consists of whitespace.
   *
   * <p>
   *
   * <p>
   *
   * <pre>
   * StringUtils.hasLength(null) = false
   * StringUtils.hasLength("") = false
   * StringUtils.hasLength(" ") = true
   * StringUtils.hasLength("Hello") = true
   * </pre>
   *
   * @param str the CharSequence to check (may be <code>null</code>)
   * @return <code>true</code> if the CharSequence is not null and has length
   * @see #hasText(String)
   */
  public static boolean hasLength(CharSequence str) {

    return (str != null && str.length() > 0);
  }

  /**
   * Check that the given String is neither <code>null</code> nor of length 0. Note: Will return
   * <code>true</code> for a String that purely consists of whitespace.
   *
   * @param str the String to check (may be <code>null</code>)
   * @return <code>true</code> if the String is not null and has length
   * @see #hasLength(CharSequence)
   */
  public static boolean hasLength(String str) {

    return hasLength((CharSequence) str);
  }

  /**
   * Check whether the given CharSequence has actual text. More specifically, returns <code>true
   * </code> if the string not <code>null</code>, its length is greater than 0, and it contains at
   * least one non-whitespace character.
   *
   * <p>
   *
   * <p>
   *
   * <pre>
   * StringUtils.hasText(null) = false
   * StringUtils.hasText("") = false
   * StringUtils.hasText(" ") = false
   * StringUtils.hasText("12345") = true
   * StringUtils.hasText(" 12345 ") = true
   * </pre>
   *
   * @param str the CharSequence to check (may be <code>null</code>)
   * @return <code>true</code> if the CharSequence is not <code>null</code>, its length is greater
   *     than 0, and it does not contain whitespace only
   * @see java.lang.Character#isWhitespace
   */
  public static boolean hasText(CharSequence str) {

    if (!hasLength(str)) {
      return false;
    }
    int strLen = str.length();
    for (int i = 0; i < strLen; i++) {
      if (!Character.isWhitespace(str.charAt(i))) {
        return true;
      }
    }
    return false;
  }

  /**
   * Check whether the given String has actual text. More specifically, returns <code>true</code> if
   * the string not <code>null</code>, its length is greater than 0, and it contains at least one
   * non-whitespace character.
   *
   * @param str the String to check (may be <code>null</code>)
   * @return <code>true</code> if the String is not <code>null</code>, its length is greater than 0,
   *     and it does not contain whitespace only
   * @see #hasText(CharSequence)
   */
  public static boolean hasText(String str) {

    return hasText((CharSequence) str);
  }

  /**
   * Check whether the given CharSequence contains any whitespace characters.
   *
   * @param str the CharSequence to check (may be <code>null</code>)
   * @return <code>true</code> if the CharSequence is not empty and contains at least 1 whitespace
   *     character
   * @see java.lang.Character#isWhitespace
   */
  public static boolean containsWhitespace(CharSequence str) {

    if (!hasLength(str)) {
      return false;
    }
    int strLen = str.length();
    for (int i = 0; i < strLen; i++) {
      if (Character.isWhitespace(str.charAt(i))) {
        return true;
      }
    }
    return false;
  }

  /**
   * Check whether the given String contains any whitespace characters.
   *
   * @param str the String to check (may be <code>null</code>)
   * @return <code>true</code> if the String is not empty and contains at least 1 whitespace
   *     character
   * @see #containsWhitespace(CharSequence)
   */
  public static boolean containsWhitespace(String str) {

    return containsWhitespace((CharSequence) str);
  }

  /**
   * Trim leading and trailing whitespace from the given String.
   *
   * @param str the String to check
   * @return the trimmed String
   * @see java.lang.Character#isWhitespace
   */
  public static String trimWhitespace(String str) {

    if (!hasLength(str)) {
      return str;
    }
    StringBuilder sb = new StringBuilder(str);
    while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
      sb.deleteCharAt(0);
    }
    while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
      sb.deleteCharAt(sb.length() - 1);
    }
    return sb.toString();
  }

  /**
   * Trim <i>all</i> whitespace from the given String: leading, trailing, and inbetween characters.
   *
   * @param str the String to check
   * @return the trimmed String
   * @see java.lang.Character#isWhitespace
   */
  public static String trimAllWhitespace(String str) {

    if (!hasLength(str)) {
      return str;
    }
    StringBuilder sb = new StringBuilder(str);
    int index = 0;
    while (sb.length() > index) {
      if (Character.isWhitespace(sb.charAt(index))) {
        sb.deleteCharAt(index);
      } else {
        index++;
      }
    }
    return sb.toString();
  }

  /**
   * Trim leading whitespace from the given String.
   *
   * @param str the String to check
   * @return the trimmed String
   * @see java.lang.Character#isWhitespace
   */
  public static String trimLeadingWhitespace(String str) {

    if (!hasLength(str)) {
      return str;
    }
    StringBuilder sb = new StringBuilder(str);
    while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
      sb.deleteCharAt(0);
    }
    return sb.toString();
  }

  /**
   * Trim trailing whitespace from the given String.
   *
   * @param str the String to check
   * @return the trimmed String
   * @see java.lang.Character#isWhitespace
   */
  public static String trimTrailingWhitespace(String str) {

    if (!hasLength(str)) {
      return str;
    }
    StringBuilder sb = new StringBuilder(str);
    while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
      sb.deleteCharAt(sb.length() - 1);
    }
    return sb.toString();
  }

  /**
   * Trim all occurences of the supplied leading character from the given String.
   *
   * @param str the String to check
   * @param leadingCharacter the leading character to be trimmed
   * @return the trimmed String
   */
  public static String trimLeadingCharacter(String str, char leadingCharacter) {

    if (!hasLength(str)) {
      return str;
    }
    StringBuilder sb = new StringBuilder(str);
    while (sb.length() > 0 && sb.charAt(0) == leadingCharacter) {
      sb.deleteCharAt(0);
    }
    return sb.toString();
  }

  /**
   * Trim all occurences of the supplied trailing character from the given String.
   *
   * @param str the String to check
   * @param trailingCharacter the trailing character to be trimmed
   * @return the trimmed String
   */
  public static String trimTrailingCharacter(String str, char trailingCharacter) {

    if (!hasLength(str)) {
      return str;
    }
    StringBuilder sb = new StringBuilder(str);
    while (sb.length() > 0 && sb.charAt(sb.length() - 1) == trailingCharacter) {
      sb.deleteCharAt(sb.length() - 1);
    }
    return sb.toString();
  }

  /**
   * Test if the given String starts with the specified prefix, ignoring upper/lower case.
   *
   * @param str the String to check
   * @param prefix the prefix to look for
   * @see java.lang.String#startsWith
   */
  public static boolean startsWithIgnoreCase(String str, String prefix) {

    if (str == null || prefix == null) {
      return false;
    }
    if (str.startsWith(prefix)) {
      return true;
    }
    if (str.length() < prefix.length()) {
      return false;
    }
    String lcStr = str.substring(0, prefix.length()).toLowerCase();
    String lcPrefix = prefix.toLowerCase();
    return lcStr.equals(lcPrefix);
  }

  /**
   * Test if the given String ends with the specified suffix, ignoring upper/lower case.
   *
   * @param str the String to check
   * @param suffix the suffix to look for
   * @see java.lang.String#endsWith
   */
  public static boolean endsWithIgnoreCase(String str, String suffix) {

    if (str == null || suffix == null) {
      return false;
    }
    if (str.endsWith(suffix)) {
      return true;
    }
    if (str.length() < suffix.length()) {
      return false;
    }

    String lcStr = str.substring(str.length() - suffix.length()).toLowerCase();
    String lcSuffix = suffix.toLowerCase();
    return lcStr.equals(lcSuffix);
  }

  /**
   * Test whether the given string matches the given substring at the given index.
   *
   * @param str the original string (or StringBuilder)
   * @param index the index in the original string to start matching against
   * @param substring the substring to match at the given index
   */
  public static boolean substringMatch(CharSequence str, int index, CharSequence substring) {

    for (int j = 0; j < substring.length(); j++) {
      int i = index + j;
      if (i >= str.length() || str.charAt(i) != substring.charAt(j)) {
        return false;
      }
    }
    return true;
  }

  /**
   * Count the occurrences of the substring in string s.
   *
   * @param str string to search in. Return 0 if this is null.
   * @param sub string to search for. Return 0 if this is null.
   */
  public static int countOccurrencesOf(String str, String sub) {

    if (str == null || sub == null || str.length() == 0 || sub.length() == 0) {
      return 0;
    }
    int count = 0;
    int pos = 0;
    int idx;
    while ((idx = str.indexOf(sub, pos)) != -1) {
      ++count;
      pos = idx + sub.length();
    }
    return count;
  }

  /**
   * Replace all occurences of a substring within a string with another string.
   *
   * @param inString String to examine
   * @param oldPattern String to replace
   * @param newPattern String to insert
   * @return a String with the replacements
   */
  public static String replace(String inString, String oldPattern, String newPattern) {

    if (!hasLength(inString) || !hasLength(oldPattern) || newPattern == null) {
      return inString;
    }
    StringBuilder sb = new StringBuilder();
    // our position in the old string
    int pos = 0;
    int index = inString.indexOf(oldPattern);
    // the index of an occurrence we've found, or -1
    int patLen = oldPattern.length();
    while (index >= 0) {
      sb.append(inString.substring(pos, index));
      sb.append(newPattern);
      pos = index + patLen;
      index = inString.indexOf(oldPattern, pos);
    }
    sb.append(inString.substring(pos));
    // remember to append any characters to the right of a match
    return sb.toString();
  }

  /**
   * Delete all occurrences of the given substring.
   *
   * @param inString the original String
   * @param pattern the pattern to delete all occurrences of
   * @return the resulting String
   */
  public static String delete(String inString, String pattern) {

    return replace(inString, pattern, "");
  }

  /**
   * Delete any character in a given String.
   *
   * @param inString the original String
   * @param charsToDelete a set of characters to delete. E.g. "az\n" will delete 'a's, 'z's and new
   *     lines.
   * @return the resulting String
   */
  public static String deleteAny(String inString, String charsToDelete) {

    if (!hasLength(inString) || !hasLength(charsToDelete)) {
      return inString;
    }
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < inString.length(); i++) {
      char c = inString.charAt(i);
      if (charsToDelete.indexOf(c) == -1) {
        sb.append(c);
      }
    }
    return sb.toString();
  }

  // ---------------------------------------------------------------------
  // Convenience methods for working with formatted Strings
  // ---------------------------------------------------------------------

  /**
   * Quote the given String with single quotes.
   *
   * @param str the input String (e.g. "myString")
   * @return the quoted String (e.g. "'myString'"), or <code>null<code> if the input was <code>null</code>
   */
  public static String quote(String str) {

    return (str != null ? "'" + str + "'" : null);
  }

  /**
   * Turn the given Object into a String with single quotes if it is a String; keeping the Object
   * as-is else.
   *
   * @param obj the input Object (e.g. "myString")
   * @return the quoted String (e.g. "'myString'"), or the input object as-is if not a String
   */
  public static Object quoteIfString(Object obj) {

    return (obj instanceof String ? quote((String) obj) : obj);
  }

  /**
   * Unqualify a string qualified by a '.' dot character. For example, "this.name.is.qualified",
   * returns "qualified".
   *
   * @param qualifiedName the qualified name
   */
  public static String unqualify(String qualifiedName) {

    return unqualify(qualifiedName, '.');
  }

  /**
   * Unqualify a string qualified by a separator character. For example, "this:name:is:qualified"
   * returns "qualified" if using a ':' separator.
   *
   * @param qualifiedName the qualified name
   * @param separator the separator
   */
  public static String unqualify(String qualifiedName, char separator) {

    return qualifiedName.substring(qualifiedName.lastIndexOf(separator) + 1);
  }

  /**
   * Capitalize a <code>String</code>, changing the first letter to upper case as per {@link
   * Character#toUpperCase(char)}. No other letters are changed.
   *
   * @param str the String to capitalize, may be <code>null</code>
   * @return the capitalized String, <code>null</code> if null
   */
  public static String capitalize(String str) {

    return changeFirstCharacterCase(str, true);
  }

  /**
   * Uncapitalize a <code>String</code>, changing the first letter to lower case as per {@link
   * Character#toLowerCase(char)}. No other letters are changed.
   *
   * @param str the String to uncapitalize, may be <code>null</code>
   * @return the uncapitalized String, <code>null</code> if null
   */
  public static String uncapitalize(String str) {

    return changeFirstCharacterCase(str, false);
  }

  private static String changeFirstCharacterCase(String str, boolean capitalize) {

    if (str == null || str.length() == 0) {
      return str;
    }
    StringBuilder sb = new StringBuilder(str.length());
    if (capitalize) {
      sb.append(Character.toUpperCase(str.charAt(0)));
    } else {
      sb.append(Character.toLowerCase(str.charAt(0)));
    }
    sb.append(str.substring(1));
    return sb.toString();
  }

  /**
   * Extract the filename from the given path, e.g. "mypath/myfile.txt" -> "myfile.txt".
   *
   * @param path the file path (may be <code>null</code>)
   * @return the extracted filename, or <code>null</code> if none
   */
  public static String getFilename(String path) {

    if (path == null) {
      return null;
    }
    int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR);
    return (separatorIndex != -1 ? path.substring(separatorIndex + 1) : path);
  }

  /**
   * Extract the filename extension from the given path, e.g. "mypath/myfile.txt" -> "txt".
   *
   * @param path the file path (may be <code>null</code>)
   * @return the extracted filename extension, or <code>null</code> if none
   */
  public static String getFilenameExtension(String path) {

    if (path == null) {
      return null;
    }
    int sepIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
    return (sepIndex != -1 ? path.substring(sepIndex + 1) : null);
  }

  /**
   * Strip the filename extension from the given path, e.g. "mypath/myfile.txt" -> "mypath/myfile".
   *
   * @param path the file path (may be <code>null</code>)
   * @return the path with stripped filename extension, or <code>null</code> if none
   */
  public static String stripFilenameExtension(String path) {

    if (path == null) {
      return null;
    }
    int sepIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
    return (sepIndex != -1 ? path.substring(0, sepIndex) : path);
  }

  /**
   * Apply the given relative path to the given path, assuming standard Java folder separation (i.e.
   * "/" separators);
   *
   * @param path the path to start from (usually a full file path)
   * @param relativePath the relative path to apply (relative to the full file path above)
   * @return the full file path that results from applying the relative path
   */
  public static String applyRelativePath(String path, String relativePath) {

    int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR);
    if (separatorIndex != -1) {
      String newPath = path.substring(0, separatorIndex);
      if (!relativePath.startsWith(FOLDER_SEPARATOR)) {
        newPath += FOLDER_SEPARATOR;
      }
      return newPath + relativePath;
    } else {
      return relativePath;
    }
  }

  /**
   * Parse the given <code>localeString</code> into a {@link Locale}.
   *
   * <p>This is the inverse operation of {@link Locale#toString Locale's toString}.
   *
   * @param localeString the locale string, following <code>Locale's</code> <code>toString()</code>
   *     format ("en", "en_UK", etc); also accepts spaces as separators, as an alternative to
   *     underscores
   * @return a corresponding <code>Locale</code> instance
   */
  public static Locale parseLocaleString(String localeString) {

    String[] parts = tokenizeToStringArray(localeString, "_ ", false, false);
    String language = (parts.length > 0 ? parts[0] : "");
    String country = (parts.length > 1 ? parts[1] : "");
    String variant = "";
    if (parts.length >= 2) {
      // There is definitely a variant, and it is everything after the country
      // code sans the separator between the country code and the variant.
      int endIndexOfCountryCode = localeString.indexOf(country) + country.length();
      // Strip off any leading '_' and whitespace, what's left is the variant.
      variant = trimLeadingWhitespace(localeString.substring(endIndexOfCountryCode));
      if (variant.startsWith("_")) {
        variant = trimLeadingCharacter(variant, '_');
      }
    }
    return (language.length() > 0 ? new Locale(language, country, variant) : null);
  }

  /**
   * Determine the RFC 3066 compliant language tag, as used for the HTTP "Accept-Language" header.
   *
   * @param locale the Locale to transform to a language tag
   * @return the RFC 3066 compliant language tag as String
   */
  public static String toLanguageTag(Locale locale) {

    return locale.getLanguage() + (hasText(locale.getCountry()) ? "-" + locale.getCountry() : "");
  }

  /**
   * Copy the given Collection into a String array. The Collection must contain String elements
   * only.
   *
   * @param collection the Collection to copy
   * @return the String array (<code>null</code> if the passed-in Collection was <code>null</code>)
   */
  public static String[] toStringArray(Collection<String> collection) {

    if (collection == null) {
      return null;
    }
    return collection.toArray(new String[collection.size()]);
  }

  /**
   * Copy the given Enumeration into a String array. The Enumeration must contain String elements
   * only.
   *
   * @param enumeration the Enumeration to copy
   * @return the String array (<code>null</code> if the passed-in Enumeration was <code>null</code>)
   */
  public static String[] toStringArray(Enumeration<String> enumeration) {

    if (enumeration == null) {
      return null;
    }
    List<String> list = Collections.list(enumeration);
    return list.toArray(new String[list.size()]);
  }

  /**
   * Split a String at the first occurrence of the delimiter. Does not include the delimiter in the
   * result.
   *
   * @param toSplit the string to split
   * @param delimiter to split the string up with
   * @return a two element array with index 0 being before the delimiter, and index 1 being after
   *     the delimiter (neither element includes the delimiter); or <code>null</code> if the
   *     delimiter wasn't found in the given input String
   */
  public static String[] split(String toSplit, String delimiter) {

    if (!hasLength(toSplit) || !hasLength(delimiter)) {
      return null;
    }
    int offset = toSplit.indexOf(delimiter);
    if (offset < 0) {
      return null;
    }
    String beforeDelimiter = toSplit.substring(0, offset);
    String afterDelimiter = toSplit.substring(offset + delimiter.length());
    return new String[] {beforeDelimiter, afterDelimiter};
  }

  /**
   * Tokenize the given String into a String array via a StringTokenizer. Trims tokens and omits
   * empty tokens.
   *
   * <p>The given delimiters string is supposed to consist of any number of delimiter characters.
   * Each of those characters can be used to separate tokens. A delimiter is always a single
   * character; for multi-character delimiters, consider using <code>delimitedListToStringArray
   * </code>
   *
   * @param str the String to tokenize
   * @param delimiters the delimiter characters, assembled as String (each of those characters is
   *     individually considered as delimiter).
   * @return an array of the tokens
   * @see java.util.StringTokenizer
   * @see java.lang.String#trim()
   * @see #delimitedListToStringArray
   */
  public static String[] tokenizeToStringArray(String str, String delimiters) {

    return tokenizeToStringArray(str, delimiters, true, true);
  }

  /**
   * Tokenize the given String into a String array via a StringTokenizer.
   *
   * <p>The given delimiters string is supposed to consist of any number of delimiter characters.
   * Each of those characters can be used to separate tokens. A delimiter is always a single
   * character; for multi-character delimiters, consider using <code>delimitedListToStringArray
   * </code>
   *
   * @param str the String to tokenize
   * @param delimiters the delimiter characters, assembled as String (each of those characters is
   *     individually considered as delimiter)
   * @param trimTokens trim the tokens via String's <code>trim</code>
   * @param ignoreEmptyTokens omit empty tokens from the result array (only applies to tokens that
   *     are empty after trimming; StringTokenizer will not consider subsequent delimiters as token
   *     in the first place).
   * @return an array of the tokens (<code>null</code> if the input String was <code>null</code>)
   * @see java.util.StringTokenizer
   * @see java.lang.String#trim()
   * @see #delimitedListToStringArray
   */
  public static String[] tokenizeToStringArray(
      String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) {

    if (str == null) {
      return null;
    }
    StringTokenizer st = new StringTokenizer(str, delimiters);
    List<String> tokens = new ArrayList<String>();
    while (st.hasMoreTokens()) {
      String token = st.nextToken();
      if (trimTokens) {
        token = token.trim();
      }
      if (!ignoreEmptyTokens || token.length() > 0) {
        tokens.add(token);
      }
    }
    return toStringArray(tokens);
  }

  /**
   * Take a String which is a delimited list and convert it to a String array.
   *
   * <p>A single delimiter can consists of more than one character: It will still be considered as
   * single delimiter string, rather than as bunch of potential delimiter characters - in contrast
   * to <code>tokenizeToStringArray</code>.
   *
   * @param str the input String
   * @param delimiter the delimiter between elements (this is a single delimiter, rather than a
   *     bunch individual delimiter characters)
   * @return an array of the tokens in the list
   * @see #tokenizeToStringArray
   */
  public static String[] delimitedListToStringArray(String str, String delimiter) {

    return delimitedListToStringArray(str, delimiter, null);
  }

  /**
   * Take a String which is a delimited list and convert it to a String array.
   *
   * <p>A single delimiter can consists of more than one character: It will still be considered as
   * single delimiter string, rather than as bunch of potential delimiter characters - in contrast
   * to <code>tokenizeToStringArray</code>.
   *
   * @param str the input String
   * @param delimiter the delimiter between elements (this is a single delimiter, rather than a
   *     bunch individual delimiter characters)
   * @param charsToDelete a set of characters to delete. Useful for deleting unwanted line breaks:
   *     e.g. "\r\n\f" will delete all new lines and line feeds in a String.
   * @return an array of the tokens in the list
   * @see #tokenizeToStringArray
   */
  public static String[] delimitedListToStringArray(
      String str, String delimiter, String charsToDelete) {

    if (str == null) {
      return new String[0];
    }
    if (delimiter == null) {
      return new String[] {str};
    }
    List<String> result = new ArrayList<String>();
    if ("".equals(delimiter)) {
      for (int i = 0; i < str.length(); i++) {
        result.add(deleteAny(str.substring(i, i + 1), charsToDelete));
      }
    } else {
      int pos = 0;
      int delPos;
      while ((delPos = str.indexOf(delimiter, pos)) != -1) {
        result.add(deleteAny(str.substring(pos, delPos), charsToDelete));
        pos = delPos + delimiter.length();
      }
      if (str.length() > 0 && pos <= str.length()) {
        // Add rest of String, but not in case of empty input.
        result.add(deleteAny(str.substring(pos), charsToDelete));
      }
    }
    return toStringArray(result);
  }

  /**
   * Convert a CSV list into an array of Strings.
   *
   * @param str the input String
   * @return an array of Strings, or the empty array in case of empty input
   */
  public static String[] commaDelimitedListToStringArray(String str) {

    return delimitedListToStringArray(str, ",");
  }

  /**
   * Convenience method to convert a CSV string list to a set. Note that this will suppress
   * duplicates.
   *
   * @param str the input String
   * @return a Set of String entries in the list
   */
  public static Set<String> commaDelimitedListToSet(String str) {

    Set<String> set = new TreeSet<String>();
    String[] tokens = commaDelimitedListToStringArray(str);
    for (String token : tokens) {
      set.add(token);
    }
    return set;
  }

  private static Pattern NUMBER_PATTERN = Pattern.compile("[0-9]+");

  public static boolean isNumeric(String str) {

    if (str == null || str.isEmpty()) {
      return false;
    }

    return NUMBER_PATTERN.matcher(str).matches();
  }

  /**
   * get sub string before the token str
   *
   * @param str
   * @param token
   * @return
   */
  public static String getSubStrBeforeToken(String str, String token) {

    int paramHttpSt = str.indexOf(token);

    if (paramHttpSt > -1) {
      str = str.substring(0, paramHttpSt);
    }
    return str;
  }

  /**
   * decode the "." to Hex
   *
   * @param src
   * @return
   */
  public static String dotdecod(String src) {

    StringBuilder sb = new StringBuilder(src.length());
    char[] chars = src.toCharArray();
    for (int i = 0; i < chars.length; i++) {
      if (chars[i] == '.') {
        sb.append("/u" + Integer.toHexString(chars[i]));
      } else {
        sb.append(chars[i]);
      }
    }
    return sb.toString();
  }

  /**
   * 获取指定长度的随机数字组成的字符串
   *
   * @param size
   * @return
   */
  public static String getRandomNumber(int size) {

    String num = "";
    for (int i = 0; i < size; i++) {
      double a = Math.random() * 9;
      a = Math.ceil(a);
      int randomNum = new Double(a).intValue();
      num += randomNum;
    }
    return num;
  }

  /**
   * @param collection
   * @param separator
   * @return
   */
  public static String join(Collection<String> collection, String separator) {

    if (collection == null) {
      return null;
    }
    return join(collection.toArray(new String[collection.size()]), separator);
  }

  /**
   * Array can not be empty, the value in an array is empty and not appended to a string
   *
   * @param array
   * @param separator
   * @return
   */
  public static String join(String[] array, String separator) {

    if (array == null) {
      return null;
    }

    if (separator == null) {
      separator = "";
    }

    StringBuilder builder = new StringBuilder();
    for (int i = 0; i < array.length; i++) {
      if (i > 0) {
        builder.append(separator);
      }
      if (array[i] != null) {
        builder.append(array[i]);
      }
    }
    return builder.toString();
  }
}
